porterskyandClaude Opus 5.5
c681ebab2b
Fetch the Boost CMake release archive (default 1.92.0) and build only the libraries requested via find_package(Boost COMPONENTS ...), plus their dependencies. Each component is exposed as Boost::<name>, e.g. Boost::serialization. cmat now uses this module instead of a system Boost install, so the Boost exercises are always available. Also fix SolutionEx62Bonus: Employee.h used base_object without including <boost/serialization/base_object.hpp>. This was not an intentional exercise bug; it likely relied on a transitive include in older Boost versions. Co-authored-by: Claude Opus 5.5 <claude.opus5.5@anthropic.com>
90 lines
3.4 KiB
CMake
90 lines
3.4 KiB
CMake
# ==============================================================================
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# Find Boost
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# ==============================================================================
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# This module fetches the Boost libraries (CMake release archive) and builds
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# only the requested components and their dependencies.
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#
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# Usage:
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# find_package(Boost REQUIRED COMPONENTS serialization program_options)
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# target_link_libraries(app PRIVATE Boost::serialization Boost::program_options)
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#
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# Components are Boost library names as they appear under libs/ (lowercase),
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# e.g. serialization, filesystem, json, asio. Header-only libraries work too.
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# Without components every Boost library is configured (slower configure);
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# targets are only built when linked.
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#
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# All components must be requested in the first find_package(Boost) call:
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# Boost is configured once, later calls can only use what was configured.
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#
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# Targets provided:
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# Boost::<component> - One target per requested component
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# Boost::headers - All configured header-only libraries
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#
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# Variables set:
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# Boost_FOUND - TRUE if Boost and all required components are available
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# Boost_<component>_FOUND - TRUE if the component is available
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# Boost_LIBRARIES - The component targets (Boost::<component>...)
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# Boost_VERSION - Version of Boost
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# ==============================================================================
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# Use the version passed to find_package(), or default to 1.92.0
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# The version must be the full x.y.z form used by the release archive names
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if (DEFINED Boost_FIND_VERSION AND NOT Boost_FIND_VERSION STREQUAL "")
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set(BOOST_VERSION "${Boost_FIND_VERSION}")
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else()
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set(BOOST_VERSION "1.92.0")
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endif()
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if (NOT DEFINED _FINDBOOST_INCLUDED)
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set(_FINDBOOST_INCLUDED TRUE)
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message(STATUS "Fetching Boost ${BOOST_VERSION} (components: ${Boost_FIND_COMPONENTS})")
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include(FetchContent)
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# Mark Boost includes as SYSTEM to suppress warnings from its headers
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set(_boost_fetch_options "")
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if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.25)
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list(APPEND _boost_fetch_options SYSTEM)
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endif()
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FetchContent_Declare(
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boost
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URL https://github.com/boostorg/boost/releases/download/boost-${BOOST_VERSION}/boost-${BOOST_VERSION}-cmake.tar.xz
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DOWNLOAD_EXTRACT_TIMESTAMP TRUE
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EXCLUDE_FROM_ALL
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${_boost_fetch_options}
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)
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# Read by the Boost superproject: build only these libraries (and their
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# dependencies). Empty means all libraries.
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set(BOOST_INCLUDE_LIBRARIES ${Boost_FIND_COMPONENTS})
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FetchContent_MakeAvailable(boost)
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unset(BOOST_INCLUDE_LIBRARIES)
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set(BOOST_LICENSE_FILE "${boost_SOURCE_DIR}/LICENSE_1_0.txt" CACHE FILEPATH "Path to Boost license file")
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endif()
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set(Boost_LIBRARIES "")
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foreach (_boost_comp IN LISTS Boost_FIND_COMPONENTS)
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if (TARGET Boost::${_boost_comp})
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set(Boost_${_boost_comp}_FOUND TRUE)
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list(APPEND Boost_LIBRARIES Boost::${_boost_comp})
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else()
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set(Boost_${_boost_comp}_FOUND FALSE)
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if (NOT Boost_FIND_QUIETLY)
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message(STATUS "Boost component '${_boost_comp}' is not available: "
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"unknown library, or not requested in the first find_package(Boost) call")
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endif()
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endif()
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endforeach()
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set(Boost_VERSION "${BOOST_VERSION}")
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(Boost
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REQUIRED_VARS boost_SOURCE_DIR
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VERSION_VAR Boost_VERSION
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HANDLE_COMPONENTS
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)
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